How do I block adult websites on a Mac for free?

The free built-in option is macOS Screen Time. Open System Settings, go to Screen Time, then Content & Privacy Restrictions, then Content Restrictions, and set Web Content to Limit Adult Websites. It applies system-wide and covers Safari. For blocking across every browser and app with your own list, the free Focuh app and SelfControl both work, and a filtering DNS service handles category-wide blocking across the whole device.

Does macOS have a built-in adult content filter?

Yes. Screen Time includes a Limit Adult Websites setting under Content & Privacy Restrictions, then Content Restrictions, then Web Content. It automatically restricts many adult sites and lets you add your own Always Allowed and Never Allowed lists. It's free and applies system-wide. Set a Screen Time passcode so it can't be switched off in a weak moment, and use a code you won't easily guess yourself.

How do I block adult websites across every browser on Mac?

Block below the browser, not inside it. macOS Screen Time's adult-content limit applies system-wide. A filtering DNS service blocks adult domains for every browser and app at once. The hosts file and SelfControl block your listed domains across all browsers, and the free Focuh app blocks listed sites across Chrome, Safari, Firefox, and Arc during focus sessions. A browser extension can never cover browsers it isn't installed in.

What's the difference between a website blocker and a porn filter?

A website blocker blocks the specific domains you add, mainly to protect attention during work. A porn filter blocks an entire category automatically using a maintained list of thousands of sites, usually at the DNS or system level. Screen Time's Limit Adult Websites is a category filter. The Focuh app and SelfControl block your own list. For recovery or accountability you want category filtering; for focus-time habits, a blocker is enough.

Can adult-site blocks on Mac be bypassed?

Most can, to different degrees. Screen Time can be turned off with its passcode, so set one you won't guess. A filtering DNS can be changed in network settings unless it's locked. SelfControl is irreversible until its timer ends. The hosts file is undone by editing one file with admin access. Focuh's block lifts by revoking Accessibility permission. Layering two methods so no single switch reopens everything is the realistic way to add friction.

How do I block adult sites only during focus sessions?

Use a timer-based blocker rather than an always-on filter. The free Focuh app blocks the sites you list across browsers and any native apps only while a focus session runs, then unblocks when it ends. That suits protecting deep work. For around-the-clock protection, pair it with an always-on layer like Screen Time's adult-content limit or a filtering DNS, so the category stays blocked even outside your focus blocks.

Is the hosts file a good way to block adult sites on Mac?

It works for a short, specific list but scales badly here. You edit /etc/hosts in Terminal and point each domain at 127.0.0.1, which blocks those exact domains across every browser. The problem is adult content spans thousands of sites, so a hand-typed hosts file is endless whack-a-mole. It's fine as a supplement for a few stubborn domains, but a category-based filter like Screen Time or a filtering DNS does the heavy lifting better.

Will my blocked list stay private?

With local tools, yes. Screen Time settings stay on your Mac and in your iCloud account. The hosts file and SelfControl are entirely local. Focuh stores your blocked sites and apps on your device with no account and no telemetry, which matters for a sensitive list. A filtering DNS service does see the domains your device requests, so if privacy is a concern, check the provider's logging policy before choosing one.

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How to Block Adult Websites on Mac (Free) — 2026

June 10, 20269 min readFocuh

Keeping adult websites off your Mac — to protect your focus, break a habit, or stay accountable — is more reliable than doing it in a single browser, because a Mac gives you tools that work below the browser entirely. This guide covers how to block adult websites on a Mac for free, across every browser and app, with each method's honest limits laid out so you don't lean on one that's easy to route around.

The fast answer

The fastest free way to block adult websites on a Mac is the built-in Screen Time filter: System Settings → Screen Time → Content & Privacy Restrictions → Content Restrictions → Web Content → Limit Adult Websites. It's a category filter, it applies system-wide, and it's free. For blocking your own list across every browser during focus sessions, add the free Focuh Mac app. For the sturdiest setup, layer a category filter under a focus tool so no single switch reopens everything.

Why a Mac blocks adult sites better than a browser does

A browser extension blocks only the domains you list, only in that browser, and it disables in two clicks. Adult content spans thousands of sites and you switch browsers without thinking, so a single-browser block leaks almost immediately.

A Mac lets you block below the browser. macOS Screen Time has a built-in adult-content category filter. A filtering DNS service refuses adult domains for every app on the device. The free Focuh app blocks at the operating-system level during focus sessions. Each of these covers ground a browser extension never can — which is the whole reason to do this at the system level instead of inside Chrome.

How to use macOS Screen Time's adult-content filter

Open System Settings and click Screen Time.
Turn on Content & Privacy Restrictions.
Open Content Restrictions, then Web Content.
Choose Limit Adult Websites. This automatically restricts many adult sites.
Use Add Website under Restricted to block specific domains, and Allowed to whitelist any false positives.
Set a Screen Time passcode so the setting can't be flipped off on impulse — pick a code you won't easily guess yourself.

Screen Time is the right starting point because it's free, built in, and category-based. Its limit isn't perfect — some sites slip through and a determined user can disable it with the passcode — but as an always-on baseline it covers far more than any hand-typed list.

Free ways to block adult sites on Mac, compared

Method	Free?	Category filter	All browsers	Hard to bypass	Timer-based
Screen Time	Yes	Yes (built-in)	System-wide	Medium	Schedule
Filtering DNS	Yes (free tiers)	Yes	Yes	Medium	No
Focuh app	Yes	No (your list)	Yes	Medium	Yes
Hosts file	Yes	No (your list)	Yes	Low–Medium	No
SelfControl	Yes	No (your list)	Yes	High	Timer

The split: the tools that filter a whole category are Screen Time and a filtering DNS, while Focuh, the hosts file, and SelfControl block the specific list you give them. The strongest setups combine both kinds. For the broader reasoning on blocking beneath the browser, see system-level website blocking on macOS.

The other free methods, briefly

Filtering DNS. Point your Mac or router at a DNS service that refuses to resolve adult domains. It covers every browser and app at once and uses a maintained category list, so you're not typing domains by hand. Several services have free tiers. It's the biggest single upgrade if Screen Time alone isn't enough, though the provider can see the domains your device requests — check their logging policy.

Focuh. The free Focuh Mac app blocks the sites you list across Chrome, Safari, Firefox, and Arc — plus native apps — at the OS level during a focus session, using macOS Accessibility APIs. It's built to protect work time rather than to filter a category, so it pairs well with Screen Time or a DNS filter rather than replacing them. The same focus-session approach covers any distraction, as in how to block apps on Mac.

SelfControl. Free and open source, it blocks a domain list until a timer ends and can't be lifted early, even by rebooting. Use it for a list of stubborn domains you want genuinely locked for a set period, on top of a category filter.

Hosts file. Editing /etc/hosts in Terminal blocks specific domains across every browser, but it scales badly against thousands of adult sites. Keep it for a few stubborn domains, not as your main filter.

How do I make adult-site blocking actually hold?

Layer it, and make sure no single switch reopens the whole category. The common failure is relying on one method with one off button. Put an always-on category filter (Screen Time or a filtering DNS) underneath a focus-session tool, so disabling one doesn't reopen everything. Set passcodes you won't guess, and hand them to a partner or accountability buddy if recovery is the goal — that turns a two-second toggle into a conversation you have to have first.

For blocks meant to last rather than reset, see how to block websites permanently on Mac, and for closing the cross-browser gap completely, how to block websites across all browsers on Mac.

Which method should you use?

You want a free built-in baseline — Screen Time's Limit Adult Websites, with a passcode set.
You want category-wide blocking across every browser and app — a filtering DNS service layered under Screen Time.
You want to protect focus time specifically — the free Focuh Mac app during sessions; for the browser side see how to block adult websites on Chrome.
You want a lock you can't lift early — SelfControl for a set period, on top of a category filter.

No single tool is a perfect wall, and anyone who promises one is overselling. The realistic answer on a Mac is a category filter you keep on all the time plus a focus tool that protects your deep work, with passcodes that add friction at the moment you'd otherwise cave. Download Focuh free for the focus-session layer, and set Screen Time's adult-content limit as the baseline underneath it.